Method for Determination of Anionic Surfactant Content by Resonance Rayleigh Scattering Method

Abstract

The invention belongs to the field of analytical chemistry and provides a method for determining content of an anionic surfactant by utilizing a resonance rayleigh scattering method. The method comprises the following steps: preparing a standard solution detection system from a citric acid-sodium citrate buffer solution, a sodium dodecyl benzene sulfonate standard solution, a safranine T solution, a polyvinyl alcohol solution, a sodium chloride solution and purified water; preparing a sample test solution detection system from the citric acid-sodium citrate buffer solution, a sample test solution, the safranine T solution, the polyvinyl alcohol solution and purified water; drawing a standard curve by determining the resonance rayleigh scattering strength, thereby lastly acquiring the content of the anionic surfactant in a sample. According to the method for determining the content of the anionic surfactant provided by the invention, the sample pretreatment is simple; the determining method is high in stability, sensitivity and accuracy; when the method is applied to the determination for the anionic surfactant in an environmental water sample, and a determining result has no obvious difference from the determining result acquired according to a national standard method.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a method for measuring the content of anionic surfactants by using a resonance Rayleigh scattering method. Background technique [0002] Anionic surfactants have good emulsifying, foaming, penetrating, decontamination and dispersing properties, and are widely used in daily life and industrial and agricultural production, but they contain anionic surfactants such as sodium dodecylbenzenesulfonate (SDBS) A large amount of industrial wastewater and domestic wastewater discharged into the water body will cause emulsification, foam and suspension due to molecular aggregation, which will seriously affect the water quality, cause the death of aquatic organisms, and cause large-scale algal blooms and red tides. Therefore, the anion surface The detection of active agents has become a must-test indicator for water quality monitoring. [0003] At present, the more common methods for the...

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Problems solved by technology

[0005] The paper "Resonance Rayleigh Scattering Spectroscopy and Analytical Application of Rhodamine 6G-Anionic Surfactant System" published by Chen Xinghui and others discloses that rhodamine 6G and dodecylbenzenesulfonic acid Sodium anionic surfactants can react to form ionic associations, leading to enhanced RRS and a new RRS spectrum. The maximum RRS peak is located at 375nm, which can be used to determine the content of anionic surfactants. The detection limit of this method for SDBS is 6ng / mL, the linear range is 0.02~5.6μg / mL, and the sensitivity is high, but the sample pretreatment steps of this method are cumbersome, and it is easily affected by the ionic strength in the sample. As the ionic strength of the sample increases, the measured resonance Rayleigh scattering intensity Gradually decreases, the error increases, and usually the ionic strength in the actual sample is larger

[0006] In the prior art, there is still a lack of a method for determining the content of anionic surfactants with simple sample pretreatment, strong measurement stability, sensitivity and high accuracy.

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